Boston Catholics were praying in mid-July for a thief — and that the thief would return a tiny relic of the True Cross that was filched from the Blessed Sacrament chapel in the city’s cathedral.

According to the Boston Globe, police suspect that the relic was stolen during the daytime because there were no signs of forced entry.

Nothing else was missing from the chapel.

The relic arrived in Boston in the late 1700s, a gift from a French priest and onetime French Navy chaplain to Father Jean-Louis Lefebvre de Cheverus, the French missionary priest who became the first bishop of Boston. The 19th-century cathedral has windows depicting stories from the True Cross, including its discovery.

Investigators were watching online auction house, eBay, where such relics were selling for between $152 and $3,800 in mid-July.